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Stick it in the kitchen oven when she is looking the other way:cool:

I expect the magazine published one was properly designed and tested, certainly describes the testing methods. It is the doubled up and rounded down one that is in question. And as we know double dimensions means 4 times the areas

The biggest unsupported area is the backhead which is approx 3" x 3" putting that through the spreadsheet that several professional boiler model boiler builders use with no stays shows the 3mm plate is only good for 42% of what it should at a modest 40psi so boiler as drawn by Julius should...

The original with it's 1.5" x 16g boiler was given as 40psi. Working pressure No pressure given for Julius's one!

Do you have a DRO on your mill if so just enter the number of hole sin the PCD function.

Wilesco tank missing it's burner tube https://www.wilesco-shop.de/en/spare-parts.html

I'd suggest sending a file off to a few of the online companies that offer CNC machining services, they can soon quote for turning them from brass, the more you want the cheaper they become. Should get a better finish than any PU cast ones and are how a lot of the WW2 aftermarket ones are made...

Taken on it's own the 3mm or 10g tube would be OK and is over what many other similar size boilers are. But that is not the whole story, the flat surfaces are the ones that are going to want to bulge as Julius shows no stays in any of them as they were not needed in the smaller original design...

Looking at the original and julius version he has just doubled up and rounded to the nearest metric number without any thought to what is available or doing any boiler calculations so The boiler is unlikely to meet any code, I assume you work to the Australian code in NZ? The unstayed areas are...

That is the problem with Julius's drawings he just rounds things to the nearest metric size. 3" x 10g tube is available, at least here it is not sure about NZ I'll see if I have the original drawings as 10g does seem a bit thick for that size traction engine.

Long thread on ME about model turbines with plenty of practical examples. https://www.model-engineer.co.uk/forums/topic/model-turbines/

I don't see anything about what you quoted me saying in post #8 or #9 I have built a lot of engines with aluminium pistons in brass cylinders so the two run together OK provided the piston is not getting pulled out of line which slop in your joints will allow.

Your use of a screwed joint is quite likely to have some play in it which could be the cause of things binding. Why not make the elbows solid as all the other elbow engines are but just bend them to suit the angle of your cylinders. At the very least make some proper pivot pins so you have a...

If you ar emaking the bearings yourself then you can size their 1/2" dimension to suite whatever size your plunged end mill produces which may come out a thou or two over 0.500" If you opt for Oilite or similar sintere dbearing sthen they do need th ehole to be correctly sizes as the bor eis...

Must admit that my flycutters seldom get use dthese days. I've gone over to insert face mills as they can be feed at 5-6 times faster for the same given chip load as a single point flycutter and as there is usually at least one insert in the cut all the time the gears in the mill's head run a...

Thanks Pat, the pumpkin orange seems to be the works colour, some had the flywheel in the same orange others with the dull red. I was tempted to do another distressed paint job on this one like I did with the Heinrici but in the end just add a coat of clear matt over the colours as I felt the...

Another notch on the workshop wall, this time a 1/5th scale model of a Denny Improved Ericsson hot air pumping engine. I drew it up from the original patent drawings and images of full size ones found on the net. The bre is 40mm and the flywheel 145mm dia. There is a mix of steel fabrications...

just noticed you show bronze on bronze, it would be better to have the slippers in bronze and a steel crosshead or run steel on iron.

Ctr of stud wants to be something like 1.25 to 1.5 D in from the edge. But make sure any nuts don't hang over the edge, I assume you will be using small hex not standard. A small edge thickness is more risky with iron than with a fabricated part as steel or brass is less likely to fracture at...

John, HT lead to spark plug Red lead to +ve battery White wire that comes out the same end as the HT lead is ground to engine frame White wire that comes out same end as red goes to an isolated contact. Circuit is made when a grounded rotating contact touches the isolated one. Ground the...